You will need to purchase a 30 day extension for ฿1,900 at your local immigration office or be prepared to pay ฿500 per day of overstay…don’t get arrested, the minors Uber 18 will have no repercussions given to them
You can do a border bounce via air or land….officially there is no limit oh the amount of Air Ins one can do, however eventually you will be questioned by an overzealous immigration officer…land border crossings you get 2 per calendar year…Vietnam depending on the passport you hold you may have to buy a visa, Singapore is nice low cost airlines go to all
I like KL Malaysia, Singapore Hong Kong, Taipei, Tokyo and Seoul usually I stay for a few days but in KL I do a 5 hour turn and burn…Vietnam since I have to buy a visa I usually stay for a week